Kisspeptin
Also known as: Metastin, KP-10
A genuinely important hormone in reproductive biology, under serious clinical investigation — and nowhere near the finished product it is sold as.
What it is
Kisspeptin is a hormone produced in the hypothalamus that sits at the top of the reproductive axis: it triggers the release of gonadotrophin-releasing hormone, which in turn drives LH, FSH and ultimately testosterone and oestrogen. Its discovery reshaped the understanding of how puberty begins.
Composition
A family of peptides derived from the KISS1 gene; the fragment most used in research is a ten-amino-acid form. What is sold online is a research chemical.
Proposed mechanism
It acts on the KISS1 receptor in the hypothalamus, stimulating GnRH release and so the whole downstream reproductive cascade. Imaging studies suggest it also modulates brain regions involved in arousal and attraction.
Claimed benefits
Raised testosterone, improved libido, and restored fertility.
What the evidence shows
Silver· human data. There is serious, ongoing clinical research here — in infertility treatment, in hypothalamic amenorrhoea, and in low sexual desire — published by academic centres and including human imaging work. Acute administration does raise LH and testosterone in men, which is well demonstrated.
What has not been established is that repeated administration produces any sustained or clinically useful change. The axis it acts on is governed by feedback that tends to blunt continuous stimulation, and no approved product or established regimen exists.
Legal & regulatory status
Not a licensed medicine. Sold online as an unregulated research chemical. Anyone competing should check current WADA status directly.
Known risks & unknowns
Short-term administration in research settings has been well tolerated. Long-term safety is unknown, and the compound acts at the top of the reproductive axis — interfering there is not a low-stakes experiment. This is a compound to follow in the literature, not to buy.
Sources
Frequently asked questions
- What is kisspeptin?
- A hormone produced in the hypothalamus that sits at the top of the reproductive axis: it triggers the release of gonadotrophin-releasing hormone, which in turn drives LH, FSH and ultimately testosterone and oestrogen. Its discovery reshaped the understanding of how puberty begins.
- What is it being studied for?
- Legitimate clinical research is investigating it in infertility treatment, in hypothalamic amenorrhoea, and in low sexual desire — including imaging studies showing it modulates brain regions involved in arousal and attraction. This is real, ongoing, published research at academic centres.
- Does it raise testosterone?
- It does raise LH and testosterone acutely in men, which is well demonstrated. What has not been established is that repeated administration produces any sustained or clinically useful change, and the axis it acts on is regulated by feedback that tends to blunt sustained stimulation.
- Should I take it?
- The research is promising and the compound is not a finished treatment. There is no approved product, no established regimen, and no long-term safety data — and interfering with the top of the reproductive axis is not a low-stakes experiment. This is a compound to watch, not to buy.
Related compounds
- PT-141 (Bremelanotide) (Gold)
An evidence-tiered explainer on PT-141 (bremelanotide, Vyleesi): a melanocortin agonist with FDA approval for a specific sexual-health condition, a useful contrast to the unapproved peptides.
- GLP-1 receptor agonists (Gold)
How GLP-1 receptor agonists (semaglutide, tirzepatide) differ from the unregulated 'research peptides': real large-scale trials, regulatory approval, and prescription-only status.
- Sermorelin (Silver)
An evidence-tiered explainer on sermorelin: a growth-hormone-releasing hormone analogue with a genuine medical history, now marketed for anti-ageing and muscle on evidence that doesn't support those claims.
Written and reviewed by Mathew Beale, MSc Biotechnology, University of Reading.
Last reviewed: